Line tension measuring instrument



Sept. 10, 1935. 1.5. WILLIAMS LINE TENSION MEASURING INSTRUMENT Filed July 15, 1933 1 I W /0 I 7 i ii E 17 Lawrence S W/Y/Iams INVENTOR ATTORNEY 15 lated for the purpose of determining force or a beveled shoulder H on the shaft and the Patented Sept. 10, 1935. A v I UN TED STATES PATENT OFFICE LIKE TENSION MEASURING INSTRUMENT Lawrence S. Williams, Toledo, Ohio, asslg'nor to Toledo Scale Manufacturing" Company, Toledo, Ohio, a corporation .of New Jersey Application July 1a, 1933, Serial No. 680,283

9-Claims. (01. 265-1) This invention relates to force measuring in- Rotatably mounted in ball bearings 3 and 4 struments and particularly ,to instruments for within the barrel l is;a shaft '5 having one end determining the resistance or ull xert d u o a formed, as illustrated in Figures IV and V, with thread or line and one of its principal objects is an end notch 6 and side grooves 1 adapted to 5 to provide a device which maybe readily conreceive a thread T, one of the furcations formed 5 nected to a thread or line while uch thr d by the end notch B being shortened to facilitate or lineis inplacein a machine. thrusting the notch over a thread T. The ball Another object is to provide a device of this hearing 3, which is subjected to radial load when class having at one end a rotatable projection for the device is in use, is pp d wi h a metallic 10 engagement with a thread or line and at the outer ball race 8, the inner race being formed 10 other end an indicator for automatically showing y a'lsdllced Portloh 9 0 the shaft The Outer the force exerted upon such thread r li race of the ball bearing 4 is formed by an annu- Another object is to provide a devic or Such lar V-shaped groove l0 cut into the interior shape and compactness as to be easily maniputhe barrel h inner race being formed y resistance exerted upon r through a, thr d or beveled end'l2 of a sleeve l3 which is threaded line. onto the reduced end M of the shaft 5. The Another object is to provide a d i of t thrust and'radial loads'to which the bearing 4 kind having maximum simplicity of h i is subjected are very slight; hence no hardened And-another object is to provide novel and trace is needed in this hearingeffective means whereby a rotatable projection Yieldable resistance to the pull upon the thread I can be connected to a line or thread. T is provided by a flat spiral spring IS, the inner Other objects andadvantages will be apparend of which is anchored to a projection is on ent m t e following description, in whi h r i- .the sleeve l3, while the other end-.is anchored erence is had to the accompany ng drawing illusin a socket l1 formed in the casing 2. The sleeve 25 trating a preferred embodiment of my invention is losked the shaft 5 by means o a locking and wherein similar reference numerals -desigscrew it. nate similar parts throughout the sever l ie Mount d upon the sleeve l3 and fixedly se- In the drawing:

. cured thereto is a dial l9, also made of light, dur- Figure I is an elevational view of the device able material such as synthetic resin, provided 30 of my invention. with graduations 20 and numerals 2| which co- Figure 11 is an enlarged sectional view taken operatewith an index 22 on the casing 2 to inupon a plane passing through the longitudinal dicate pull upon the thread T. A ferrule 23, axis of the device, the central rotatable shaft forced over the end of the barrel 1, serves to exbeing shown inelevation and a part beingbroken clude dlrtfrom the ball bearing 3 and give the out for the purpose of shortening the figure. device a finished appearance.

Figure III is a vertical sectional view taken In using the device the notch 6 1s thrust over on the line TIL-III of Figure 11. the thread so that the thread is straddled by the Figure IV is a further enlarged end view of furcation formed by the notch. The entire in- 40 a thread engaging projection of my device snowstrument is then turned to the right to wind the 40 ing a thread engaged thereby; and thread about the end of the shaft in the manner Figui'e V is a similarly enlarged side vi of shown in Figures IV and V, the portions lying in the thread nga ing projection showing a thread the side notches 1 acting to bind the adjacent engaged thereby. portions and prevent slippage. The instrument 4 Referring to the drawingin detail, the body of is then given another right turn to wrap the the device co sists f a barr l l upon on end thread about the unnotched portion of the shaft of which is formed a casing 2, the barrel and and the instrument while held with its case percasing preferablybeing integrally formed of light, pendicular to the direction of extension of the durable material such as synthetic resin. In thread is bodily moved in a direction to exert a an embodiment of my invention intended for pull upon the thread. 5O measuring tension on thread in sewing machines, The pull of the thread, a ting upon the periphthe barrel is comparable in size to that of a large cry of the shaft extension, rotates it against the fountain pen and constitutes a handle,-while the resistance of the spring 15, and the dial l9, which casing is comparable in size to that of a large is so mounted as to rotate with the shaft 5, turns 65 watch to a position in which the pull upon the thread is indicated by the condition of registration of d numerals on the dial with the index 22 on the non-rotating casing 2. It, for example, the thread Passes through so-called tension means on a sewing machine, the amount of resistance: exerted by such tension turning eiIort.

on said line will exert a eirort on said shaft, 1 mean mounted within d casing for yieldably r such turning efl'ort of said shaft, means for indicatingthe amount of regarded as illustrative such t efiort including a conical chart fixed to said shaft and bearing indicia co-operatasing bination, a barrel adapted to serve as a handle, a

and bearing indicia co-operating with an index 14 on said casing. 6. In a device of the class described, in combination, a rotatable shaft having an axially exturning effort, and means for amount of such turning efiort.

- 7. In a device of the class described, in combishatt, torsionally acting means for yieldably re- 55 LAWRENCE s.- WILLIAMS. 6o 

